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ACCRUED EXPENSES (Tables) | 12 Months Ended
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Dec. 31, 2018
Payables and Accruals [Abstract] |
Schedule of accrued expenses | Accrued expenses consist of the following (in thousands):
| December 31,
| 2018 |  | 2017
Accrued operating expenses | $ | 23,019 |  |  | $ | 20,646 |
Compensation and benefits | 16,974 |  |  | 12,295 |
Accrued royalties | 2,286 |  |  | 4,091 |
Accrued interest | 2,053 |  |  | 2,053 |
Product returns, rebates and other fees | 1,533 |  |  | 1,972 |
Total | $ | 45,865 |  |  | $ | 41,057 |

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